J/ψ production in the hadronic decays of the Z

Abstract

A search for completely reconstructed B meson decays to nal states including a J= gave a signal of 15 5 e v ents.

Study of charmonium production in $${b} $$ b -hadron decays and first evidence for the decay $${{{B}} ^0_{{s}}} \!\rightarrow \phi \phi \phi $$ B s 0 → ϕ ϕ ϕ

“…The central value is lower than the central values measured by the DELPHI [8] and L3 [9] experiments at LEP, (11.3 +5.8 −5.0 ± 0.4) × 10 −3 and (19 ± 7 ± 1) × 10 −3 , respectively. For the measurements with different b-hadron content, the LHCb result is consistent with measurements by CLEO [2], Belle [4], and BaBar [5].…”

“…The branching fractions of b-hadron decays to final states including a J/ψ or ψ(2S) charmonium state, where all b-hadron species are involved, are known with uncertainties of around 10%, with the world averages dominated by the measurements performed at LEP [8][9][10]. The ratio of b → ψ(2S)X and b → J/ψX yields has been measured at the LHC by the LHCb, CMS and ATLAS collaborations with a precision of around 5% [11][12][13].…”

“…The ratio of b → ψ(2S)X and b → J/ψX yields has been measured at the LHC by the LHCb, CMS and ATLAS collaborations with a precision of around 5% [11][12][13]. The only available results for the χ c family are the χ c1 inclusive production rates in b-hadron decays measured by the DELPHI and L3 collaborations [8,9], with an average value of B(b → χ c1 X ) = (14 ± 4) × 10 −3 [14]. Recently, LHCb measured the η c (1S) production rate, B(b → η c (1S)X ) = (4.88 ± 0.64 ± 0.29 ± 0.67 B ) × 10 −3 , where the third uncertainty is due to uncertainties on the J/ψ inclusive branching fraction from b-hadron decays and the branching fractions of the decays of J/ψ and η c (1S) to the p p final state [15].…”

Measurement of J/Ψ production in pp collisions at $\sqrt{s}=7$ TeV

“…where α 4π = 5.88 is the ratio of J/ψ from b events in the full range to the number of events in the region 2.0 < y < 4.5 and B(b → J/ψ X) = (1.16 ± 0.10)% is the average branching fraction of inclusive b-hadron decays to J/ψ measured at LEP [34][35][36]. The result is…”

“…The extrapolation to the full polar angle to obtain the bb cross-section uses the average branching fraction of inclusive b-hadron decays to J/ψ measured at LEP, i.e., B(b → J/ψ X) = (1.16 ± 0.10)% [34][35][36]. The underlying assumption is that the b-hadron fractions in pp collisions at √ s = 7 TeV are identical to those seen in Z → bb decays.…”